package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GuLiMallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author Yanglinfengkk
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService feignService;

    @Override
    public SearchResult search(SearchParam param) {
        //动态构建出插入需要的DSL语句
        //1.准备检索请求
        SearchResponse response = null;
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //2.执行检索请求
            //3.分析响应数据封装成需要的格式
            response = client.search(searchRequest, GuLiMallElasticSearchConfig.COMMON_OPTIONS);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return buildSearchResult(response, param);

    }

    /**
     * 准备检索请求
     * 模糊匹配,过滤(属性,分类,品牌,价格区间,库存),排序,分页,高亮,聚合分析
     * 如果是嵌入式的属性,查询,聚合,分析都应该用嵌入式的
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //构建DSL语句
        SearchRequest request = new SearchRequest();
        request.indices(EsConstant.PRODUCT_INDEX);
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        /**
         * 查询条件:模糊匹配,过滤(属性,分类,品牌,价格区间,库存)
         */
        //1.构建bool-Query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1   must模糊匹配    param.getKeyword()页面传递过来的值
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2   bool-Query-filter过滤    按照三级分类ID查询
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.3构建我们的品牌的id
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        //1.4按照是否有库存进行查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.5价格区间
        String skuPrice = param.getSkuPrice();
        if (!StringUtils.isEmpty(skuPrice)) {
            String[] s = skuPrice.split("_");
            if (s.length == 2) {
                if (!StringUtils.isEmpty(s[0])) {
                    boolQuery.filter(QueryBuilders.rangeQuery("skuPrice").gte(s[0]).lte(s[1]));
                } else {
                    boolQuery.filter(QueryBuilders.rangeQuery("skuPrice").lte(s[1]).gte(0));
                }
            } else {
                boolQuery.filter(QueryBuilders.rangeQuery("skuPrice").gte(s[0]));
            }
        }

        //1.6按照所有指定的属性进行查询/多个
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String attrStr : param.getAttrs()) {
                String[] s = attrStr.split("_");
                BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
                boolQueryBuilder.must(QueryBuilders.termQuery("attrs.attrId", s[0]));
                boolQueryBuilder.must(QueryBuilders.termsQuery("attrs.attrValue", s[1].split(":")));
                boolQuery.filter(QueryBuilders.nestedQuery("attrs", boolQueryBuilder, ScoreMode.None));
            }

        }

        //所有查询条件都拿来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序,分页,高亮
         */
        //2.1 排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            //sort=hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        //2.2 分页 pageSize:5
        // pageNum:1    from:0      size:5  [0,1,2,3,4]
        // pageNum:2    from:5      size:5 [5,6,,7,8,9]
        //from =(pageNum - 1) * size
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        //2.3高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //1.1 品牌聚合/子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        //TODO  1.聚合brand/品牌信息
        sourceBuilder.aggregation(brand_agg);

        //2.分类聚合
        TermsAggregationBuilder catelog_agg = AggregationBuilders.terms("catelog_agg");
        catelog_agg.field("catalogId").size(20);
        //2.1分类聚合/子聚合
        catelog_agg.subAggregation(AggregationBuilders.terms("catelog_name_agg").field("catalogName").size(1));
        //TODO  2.聚合catelog/分类信息
        sourceBuilder.aggregation(catelog_agg);

        //3.属性聚合
        NestedAggregationBuilder nestedAttrs = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg");
        attr_id_agg.field("attrs.attrId");
        //聚合分析当前attr_id对应的所有可能属性值
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合分析当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        nestedAttrs.subAggregation(attr_id_agg);
        //TODO  3.聚合attrs/属性信息
        sourceBuilder.aggregation(nestedAttrs);

        String s = sourceBuilder.toString();
        System.out.println("构建的DSL语句" + s);
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        /*=========================以下从聚合信息获取=========================*/
        //1.返回所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<SkuEsModel>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        param.getAttrs();

        //2.当前所有商品涉及到的所有属性信息 嵌入式
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1.得到属性ID
            long attrId = bucket.getKeyAsNumber().longValue();
            //2.得到属性名
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //3.得到属性值
            List<String> attrValue = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValue);


            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        //3.当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1.得到品牌的ID
            long brandId = bucket.getKeyAsNumber().longValue();
            //2.得到品牌名
            String brand_name_agg = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            //3.得到品牌图片
            String brand_img_agg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();

            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brand_name_agg);
            brandVo.setBrandImg(brand_img_agg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4.当前所有商品涉及到的所有分类信息
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catelog_agg = response.getAggregations().get("catelog_agg");
        List<? extends Terms.Bucket> buckets = catelog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类ID
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名
            ParsedStringTerms catelog_name_agg = bucket.getAggregations().get("catelog_name_agg");
            String catelog_name = catelog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catelog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        /*=========================分页信息=========================*/
        //5.1   分页信息-当前页码
        result.setPageNum(param.getPageNum());
        //5.2   分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //5.3   分心信息-总页码    计算      11/2=5.....1
        int totalPages = (int) total % EsConstant.PRODUCT_PAGESIZE == 0 ?
                (int) total / EsConstant.PRODUCT_PAGESIZE :
                ((int) total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6.构建面包屑导航
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //6.1分析每一个attrs传过来的查询参数
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //attrs=2_5寸:6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = feignService.attrInfo(Long.parseLong(s[0]));
                //用于面包屑判断动态显示隐藏
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                //6.2.取消面包屑以后,我们跳转到那个地方,将请求地址的URL里面的当前置空
                //拿到所有的查询条件,去掉当前    attrs=  23_LIO-ANOO
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }

        //品牌,分类
        List<Long> brandId = param.getBrandId();
        if (brandId != null && brandId.size() > 0) {
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = feignService.brandsinfo(brandId);
            if (r.getCode() == 0) {
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer=new StringBuffer();
                String replace=null;
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName()+";");
                    replace = replaceQueryString(param, brandVo.getBrandId()+"","brandId");

                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }

            navs.add(navVo);
        }

        //TODO 分类:不需要导航取消,可以不拼地址
        return result;
    }

    /**
     * 需要替换的值,且进行浏览器与Java乱码处理
     * @param param
     * @param value
     * @return
     */
    private String replaceQueryString(SearchParam param, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            //浏览器对空格的编码跟java不一样,需要差异化处理
            encode = encode.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&"+key+"=" + encode, "");
    }

}
